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Multi-component seismic data amplitude-preserving angle domain common imaging point gather extraction method and system

A technology for common imaging point gathers and seismic data, which is applied in the field of multi-component seismic data preservation and angle domain common imaging point gather extraction, which can solve the problem of amplitude imbalance, limited acquisition aperture, and angle domain common imaging point gather resolution. Low and other problems, to achieve the effect of improving accuracy, high signal-to-noise ratio, and high resolution

Active Publication Date: 2021-03-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as inaccurate velocity, limited acquisition aperture, uneven illumination, and inaccurate migration operators, the angle-domain common imaging point gathers extracted based on current existing methods have low resolution, unbalanced amplitude, and low The wave number artifact is serious, which has a great impact on subsequent data processing and interpretation, making it difficult to be directly used in actual production, and making it difficult to take advantage of the angle-domain common imaging point gather

Method used

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  • Multi-component seismic data amplitude-preserving angle domain common imaging point gather extraction method and system
  • Multi-component seismic data amplitude-preserving angle domain common imaging point gather extraction method and system
  • Multi-component seismic data amplitude-preserving angle domain common imaging point gather extraction method and system

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example 1

[0159] figure 2 is a two-dimensional horizontal layered media model. 21 explosion sources are set on this model, the source wavelet is set as Reck wavelet, the main frequency is 20 Hz, the initial source point is located at (2500m, 100m), and the shot interval is 50m. The receiving observation system on both sides of the middle shooting is adopted, the maximum offset distance of one side is 2500m, the minimum offset distance is 0m, the track spacing is 10m, the recording time length is 2.5s, and the time step is 1ms. image 3 yes figure 2 The multi-wave local offset domain common imaging point gather of the 2D horizontal layered medium model shown: where, image 3 (a) is the common imaging point gather in the P-wave local offset domain obtained by the traditional method, image 3 (b) is the common imaging point gather in the shear wave local offset domain obtained by the traditional method, image 3 (c) is the common imaging point gather in the longitudinal wave local o...

example 2

[0161] Figure 5 is a two-dimensional simple medium model. 39 explosion sources are set on this model, the source wavelet is set as Reck wavelet, the main frequency is 20 Hz, the initial source point is located at (100m, 100m), and the shot interval is 100m. The receiving observation system on both sides of the middle shot is adopted, the maximum offset distance of one side is 1500m, the minimum offset distance is 0m, the track spacing is 10m, the recording time length is 2.5s, and the time step is 1ms. Figure 6 yes Figure 5 The seismic record section of the 2D simple medium model shown; where, Figure 6 (a) the observation record x component of the 20th shot, Figure 6 (b) the observed z-component of the 20th shot, Figure 6 (c) The predicted recorded x-component of the 20th shot using conventional methods, Figure 6 (d) The predicted recorded z-component of the 20th shot using the traditional method, Figure 6 (e) utilize the predicted record x component of the 20th...

example 3

[0163] Figure 9 is the Marmousi-2 migration model provided by the present invention; wherein, (a) P-wave velocity model, (b) S-wave velocity model, (c) density model. This model is one of the international standard models to verify the imaging effects of various migration methods. The model has a depth of 5.4km and a lateral width of 27.2km. The spatial grid size used for the migration is 10m, with a total of 109 shots. The initial shot point is located at 2.55km from the model, and the shot point is placed at a depth of 150m. The shot interval is 200m. Shots are fired in the middle and received on both sides. For reception, the minimum offset is 0m, the maximum offset is 2500m, the track spacing is 10m, the recording time length is 8.0s, and the time step is 1ms. The Reich wavelet with a main frequency of 15Hz is used as the source time function. Figure 10 yes Figure 9 The multi-shot stacked migration section of the Marmousi-2 model is shown: where, Figure 10 (a) The ...

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Abstract

The invention relates to a multi-component seismic data amplitude-preserving angle domain common imaging point gather extraction method and system. The method comprises the following steps of constructing a forward-propagation multi-component seismic wave field; calculating a gradient profile according to the forward-propagation multi-component seismic wave field; constructing a descending direction profile based on the gradient profile; utilizing the descending direction profile to obtain a predicted seismic wave field; calculating a predicted multi-component seismic record increment based onthe predicted seismic wave field; updating the offset domain common imaging point gather and predicting the multi-component seismic record according to the optimal step length, the descending direction profile and the multi-component seismic record increment; judging whether convergence standards are met or not; if so, outputting a final offset domain common imaging point gather and determining an optimal angle domain common imaging point gather; and if not, calculating the offset domain common imaging point gather gradient profile of the next iteration until the optimal angle domain common imaging point gather is obtained. According to the method, the multi-wave angle domain common imaging point gather with high precision, high resolution, high signal-to-noise ratio and amplitude fidelity can be obtained.

Description

technical field [0001] The invention relates to the field of pre-stack depth migration imaging processing of multi-component seismic data, in particular to a method and system for extracting common imaging point gathers of multi-component seismic data in the amplitude-preserving angle domain. Background technique [0002] At present, the global oil and gas exploration targets have gradually changed from conventional to unconventional, medium-deep to deep, mid-shallow to deep, and conventional to extreme. New objects face challenges such as deeper, farther, and more extreme environments, which are the focus and difficulty of future exploration technology research. Seismic migration imaging technology is one of the key technologies in the application of seismic exploration in oil and gas field development. In the face of new exploration objects, the detection target has shifted from traditional structural oil and gas reservoirs to subtle lithological oil and gas reservoirs. T...

Claims

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/512
Inventor 谷丙洛黄建平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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